src/rowpainter.C

   1 /**
   2  * \file rowpainter.C
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author various
   7  * \author John Levon
   8  *
   9  * Full author contact details are available in file CREDITS.
  10  */
  11
  12 #include <config.h>
  13
  14 #include "rowpainter.h"
  15
  16 #include "buffer.h"
  17 #include "coordcache.h"
  18 #include "cursor.h"
  19 #include "debug.h"
  20 #include "bufferparams.h"
  21 #include "BufferView.h"
  22 #include "encoding.h"
  23 #include "gettext.h"
  24 #include "language.h"
  25 #include "LColor.h"
  26 #include "lyxrc.h"
  27 #include "lyxrow.h"
  28 #include "lyxrow_funcs.h"
  29 #include "metricsinfo.h"
  30 #include "paragraph.h"
  31 #include "paragraph_funcs.h"
  32 #include "ParagraphParameters.h"
  33 #include "vspace.h"
  34
  35 #include "frontends/font_metrics.h"
  36 #include "frontends/nullpainter.h"
  37 #include "frontends/Painter.h"
  38
  39 #include "insets/insettext.h"
  40
  41 #include "support/textutils.h"
  42
  43 #include <boost/crc.hpp>
  44
  45 using lyx::docstring;
  46 using lyx::frontend::Painter;
  47 using lyx::frontend::NullPainter;
  48 using lyx::char_type;
  49 using lyx::pos_type;
  50 using lyx::pit_type;
  51
  52 using std::endl;
  53 using std::max;
  54 using std::min;
  55 using std::string;
  56
  57
  58 namespace {
  59
  60 /// Flag: do a full redraw of inside text of inset
  61 /// Working variable indicating a full screen refresh
  62 bool refreshInside;
  63
  64 /**
  65  * A class used for painting an individual row of text.
  66  */
  67 class RowPainter {
  68 public:
  69         /// initialise and run painter
  70         RowPainter(PainterInfo & pi, LyXText const & text,
  71                 pit_type pit, Row const & row, int x, int y);
  72
  73         // paint various parts
  74         void paintAppendix();
  75         void paintDepthBar();
  76         void paintChangeBar();
  77         void paintFirst();
  78         void paintLast();
  79         void paintText();
  80
  81 private:
  82         void paintForeignMark(double orig_x, LyXFont const & font, int desc = 0);
  83         void paintHebrewComposeChar(lyx::pos_type & vpos, LyXFont const & font);
  84         void paintArabicComposeChar(lyx::pos_type & vpos, LyXFont const & font);
  85         void paintChars(lyx::pos_type & vpos, LyXFont font,
  86                         bool hebrew, bool arabic);
  87         int paintAppendixStart(int y);
  88         void paintFromPos(lyx::pos_type & vpos);
  89         void paintInset(lyx::pos_type const pos, LyXFont const & font);
  90
  91         /// return left margin
  92         int leftMargin() const;
  93
  94         /// return the label font for this row
  95         LyXFont const getLabelFont() const;
  96
  97         /// bufferview to paint on
  98         BufferView const & bv_;
  99
 100         /// Painter to use
 101         Painter & pain_;
 102
 103         /// LyXText for the row
 104         LyXText const & text_;
 105         ParagraphList const & pars_;
 106
 107         /// The row to paint
 108         Row const & row_;
 109
 110         /// Row's paragraph
 111         pit_type const pit_;
 112         Paragraph const & par_;
 113
 114         /// is row erased? (change tracking)
 115         bool erased_;
 116
 117         // Looks ugly - is
 118         double const xo_;
 119         int const yo_;    // current baseline
 120         double x_;
 121         int width_;
 122         double separator_;
 123         double hfill_;
 124         double label_hfill_;
 125 };
 126
 127
 128 RowPainter::RowPainter(PainterInfo & pi,
 129         LyXText const & text, pit_type pit, Row const & row, int x, int y)
 130         : bv_(*pi.base.bv), pain_(pi.pain), text_(text), pars_(text.paragraphs()),
 131           row_(row), pit_(pit), par_(text.paragraphs()[pit]),
 132           erased_(pi.erased_),
 133           xo_(x), yo_(y), width_(text_.width())
 134 {
 135         RowMetrics m = text_.computeRowMetrics(pit, row_);
 136         x_ = m.x + xo_;
 137
 138         //lyxerr << "RowPainter: x: " << x_ << " xo: " << xo_ << " yo: " << yo_ << endl;
 139         //row_.dump();
 140
 141         separator_ = m.separator;
 142         hfill_ = m.hfill;
 143         label_hfill_ = m.label_hfill;
 144
 145         BOOST_ASSERT(pit >= 0);
 146         BOOST_ASSERT(pit < int(text.paragraphs().size()));
 147 }
 148
 149
 150 LyXFont const RowPainter::getLabelFont() const
 151 {
 152         return text_.getLabelFont(par_);
 153 }
 154
 155
 156 int RowPainter::leftMargin() const
 157 {
 158         return text_.leftMargin(pit_, row_.pos());
 159 }
 160
 161
 162 void RowPainter::paintInset(pos_type const pos, LyXFont const & font)
 163 {
 164         InsetBase const * inset = par_.getInset(pos);
 165         BOOST_ASSERT(inset);
 166         PainterInfo pi(const_cast<BufferView *>(&bv_), pain_);
 167         // FIXME: We should always use font, see documentation of
 168         // noFontChange() in insetbase.h.
 169         pi.base.font = inset->noFontChange() ?
 170                 bv_.buffer()->params().getFont() :
 171                 font;
 172         pi.ltr_pos = (text_.bidi.level(pos) % 2 == 0);
 173         pi.erased_ = erased_ || isDeletedText(par_, pos);
 174         theCoords.insets().add(inset, int(x_), yo_);
 175         InsetText const * const in = inset->asTextInset();
 176         // non-wide insets are painted completely. Recursive
 177         bool tmp = refreshInside;
 178         if (!in || !in->Wide()) {
 179                 refreshInside = true;
 180                 lyxerr[Debug::PAINTING] << endl << "Paint inset fully" << endl;
 181         }
 182         if (refreshInside)
 183                 inset->drawSelection(pi, int(x_), yo_);
 184         inset->draw(pi, int(x_), yo_);
 185         refreshInside = tmp;
 186         x_ += inset->width();
 187 }
 188
 189
 190 void RowPainter::paintHebrewComposeChar(pos_type & vpos, LyXFont const & font)
 191 {
 192         pos_type pos = text_.bidi.vis2log(vpos);
 193
 194         string str;
 195
 196         // first char
 197         char_type c = par_.getChar(pos);
 198         str += c;
 199         ++vpos;
 200
 201         int const width = font_metrics::width(c, font);
 202         int dx = 0;
 203
 204         for (pos_type i = pos - 1; i >= 0; --i) {
 205                 c = par_.getChar(i);
 206                 if (!Encodings::isComposeChar_hebrew(c)) {
 207                         if (isPrintableNonspace(c)) {
 208                                 int const width2 =
 209                                         text_.singleWidth(par_, i, c, text_.getFont(par_, i));
 210                                 // dalet / resh
 211                                 dx = (c == 'ø' || c == 'ã')
 212                                         ? width2 - width
 213                                         : (width2 - width) / 2;
 214                         }
 215                         break;
 216                 }
 217         }
 218
 219         // Draw nikud
 220         docstring dstr(str.begin(), str.end());
 221         pain_.text(int(x_) + dx, yo_, dstr, font);
 222 }
 223
 224
 225 void RowPainter::paintArabicComposeChar(pos_type & vpos, LyXFont const & font)
 226 {
 227         pos_type pos = text_.bidi.vis2log(vpos);
 228         string str;
 229
 230         // first char
 231         char_type c = par_.getChar(pos);
 232         c = par_.transformChar(c, pos);
 233         str += c;
 234         ++vpos;
 235
 236         int const width = font_metrics::width(c, font);
 237         int dx = 0;
 238
 239         for (pos_type i = pos - 1; i >= 0; --i) {
 240                 c = par_.getChar(i);
 241                 if (!Encodings::isComposeChar_arabic(c)) {
 242                         if (isPrintableNonspace(c)) {
 243                                 int const width2 =
 244                                         text_.singleWidth(par_, i, c, text_.getFont(par_, i));
 245                                 dx = (width2 - width) / 2;
 246                         }
 247                         break;
 248                 }
 249         }
 250         // Draw nikud
 251         docstring dstr(str.begin(), str.end());
 252         pain_.text(int(x_) + dx, yo_, dstr, font);
 253 }
 254
 255
 256 void RowPainter::paintChars(pos_type & vpos, LyXFont font,
 257                             bool hebrew, bool arabic)
 258 {
 259         pos_type pos = text_.bidi.vis2log(vpos);
 260         pos_type const end = row_.endpos();
 261         FontSpan const font_span = par_.fontSpan(pos);
 262         Change::Type const prev_change = par_.lookupChange(pos).type;
 263
 264         // first character
 265 #if 0
 266         string str;
 267         str += par_.getChar(pos);
 268 #else
 269         std::vector<char_type> str;
 270         str.push_back(par_.getChar(pos));
 271 #endif
 272         if (arabic) {
 273                 char_type c = str[0];
 274                 str[0] = par_.transformChar(c, pos);
 275         }
 276
 277         // collect as much similar chars as we can
 278         for (++vpos ; vpos < end ; ++vpos) {
 279                 pos = text_.bidi.vis2log(vpos);
 280                 if (pos < font_span.first || pos > font_span.last)
 281                         break;
 282
 283                 if (prev_change != par_.lookupChange(pos))
 284                         break;
 285
 286                 char_type c = par_.getChar(pos);
 287
 288                 if (!isPrintableNonspace(c))
 289                         break;
 290
 291                 if (arabic && Encodings::isComposeChar_arabic(c))
 292                         break;
 293
 294                 if (hebrew && Encodings::isComposeChar_hebrew(c))
 295                         break;
 296
 297                 if (arabic)
 298                         c = par_.transformChar(c, pos);
 299
 300 #if 0
 301                 str += c;
 302 #else
 303                 str.push_back(c);
 304 #endif
 305         }
 306
 307         if (prev_change == Change::DELETED)
 308                 font.setColor(LColor::strikeout);
 309         else if (prev_change == Change::INSERTED)
 310                 font.setColor(LColor::newtext);
 311
 312         // Draw text and set the new x position
 313         //lyxerr << "paint row: yo_ " << yo_ << "\n";
 314 #if 0
 315         pain_.text(int(x_), yo_, str, font);
 316         x_ += font_metrics::width(str, font);
 317 #else
 318         pain_.text(int(x_), yo_, &str[0], str.size(), font);
 319         x_ += font_metrics::width(&str[0], str.size(), font);
 320 #endif
 321 }
 322
 323
 324 void RowPainter::paintForeignMark(double orig_x, LyXFont const & font, int desc)
 325 {
 326         if (!lyxrc.mark_foreign_language)
 327                 return;
 328         if (font.language() == latex_language)
 329                 return;
 330         if (font.language() == bv_.buffer()->params().language)
 331                 return;
 332
 333         int const y = yo_ + 1 + desc;
 334         pain_.line(int(orig_x), y, int(x_), y, LColor::language);
 335 }
 336
 337
 338 void RowPainter::paintFromPos(pos_type & vpos)
 339 {
 340         pos_type const pos = text_.bidi.vis2log(vpos);
 341         LyXFont orig_font = text_.getFont(par_, pos);
 342
 343         double const orig_x = x_;
 344
 345         if (par_.isInset(pos)) {
 346                 paintInset(pos, orig_font);
 347                 ++vpos;
 348                 paintForeignMark(orig_x, orig_font,
 349                         par_.getInset(pos)->descent());
 350                 return;
 351         }
 352
 353         // usual characters, no insets
 354         char_type const c = par_.getChar(pos);
 355
 356         // special case languages
 357         std::string const & lang = orig_font.language()->lang();
 358         bool const hebrew = lang == "hebrew";
 359         bool const arabic = lang == "arabic" &&
 360                 (lyxrc.font_norm_type == LyXRC::ISO_8859_6_8 ||
 361                 lyxrc.font_norm_type == LyXRC::ISO_10646_1);
 362
 363         // draw as many chars as we can
 364         if ((!hebrew && !arabic)
 365                 || (hebrew && !Encodings::isComposeChar_hebrew(c))
 366                 || (arabic && !Encodings::isComposeChar_arabic(c))) {
 367                 paintChars(vpos, orig_font, hebrew, arabic);
 368         } else if (hebrew) {
 369                 paintHebrewComposeChar(vpos, orig_font);
 370         } else if (arabic) {
 371                 paintArabicComposeChar(vpos, orig_font);
 372         }
 373
 374         paintForeignMark(orig_x, orig_font);
 375 }
 376
 377
 378 void RowPainter::paintChangeBar()
 379 {
 380         pos_type const start = row_.pos();
 381         pos_type const end = row_.endpos();
 382
 383         if (start == end || !par_.isChanged(start, end))
 384                 return;
 385
 386         int const height = text_.isLastRow(pit_, row_)
 387                 ? row_.ascent()
 388                 : row_.height();
 389
 390         pain_.fillRectangle(4, yo_ - row_.ascent(), 5, height, LColor::changebar);
 391 }
 392
 393
 394 void RowPainter::paintAppendix()
 395 {
 396         if (!par_.params().appendix())
 397                 return;
 398
 399         int y = yo_ - row_.ascent();
 400
 401         if (par_.params().startOfAppendix())
 402                 y += 2 * defaultRowHeight();
 403
 404         pain_.line(1, y, 1, yo_ + row_.height(), LColor::appendix);
 405         pain_.line(width_ - 2, y, width_ - 2, yo_ + row_.height(), LColor::appendix);
 406 }
 407
 408
 409 void RowPainter::paintDepthBar()
 410 {
 411         Paragraph::depth_type const depth = par_.getDepth();
 412
 413         if (depth <= 0)
 414                 return;
 415
 416         Paragraph::depth_type prev_depth = 0;
 417         if (!text_.isFirstRow(pit_, row_)) {
 418                 pit_type pit2 = pit_;
 419                 if (row_.pos() == 0)
 420                         --pit2;
 421                 prev_depth = pars_[pit2].getDepth();
 422         }
 423
 424         Paragraph::depth_type next_depth = 0;
 425         if (!text_.isLastRow(pit_, row_)) {
 426                 pit_type pit2 = pit_;
 427                 if (row_.endpos() >= pars_[pit2].size())
 428                         ++pit2;
 429                 next_depth = pars_[pit2].getDepth();
 430         }
 431
 432         for (Paragraph::depth_type i = 1; i <= depth; ++i) {
 433                 int const w = nestMargin() / 5;
 434                 int x = int(xo_) + w * i;
 435                 // only consider the changebar space if we're drawing outermost text
 436                 if (text_.isMainText())
 437                         x += changebarMargin();
 438
 439                 int const starty = yo_ - row_.ascent();
 440                 int const h =  row_.height() - 1 - (i - next_depth - 1) * 3;
 441
 442                 pain_.line(x, starty, x, starty + h, LColor::depthbar);
 443
 444                 if (i > prev_depth)
 445                         pain_.fillRectangle(x, starty, w, 2, LColor::depthbar);
 446                 if (i > next_depth)
 447                         pain_.fillRectangle(x, starty + h, w, 2, LColor::depthbar);
 448         }
 449 }
 450
 451
 452 int RowPainter::paintAppendixStart(int y)
 453 {
 454         LyXFont pb_font;
 455         pb_font.setColor(LColor::appendix);
 456         pb_font.decSize();
 457
 458         string const label = lyx::to_utf8(_("Appendix"));
 459         int w = 0;
 460         int a = 0;
 461         int d = 0;
 462         docstring dlab(label.begin(), label.end());
 463         font_metrics::rectText(dlab, pb_font, w, a, d);
 464
 465         int const text_start = int(xo_ + (width_ - w) / 2);
 466         int const text_end = text_start + w;
 467
 468         pain_.rectText(text_start, y + d, dlab, pb_font, LColor::none, LColor::none);
 469
 470         pain_.line(int(xo_ + 1), y, text_start, y, LColor::appendix);
 471         pain_.line(text_end, y, int(xo_ + width_ - 2), y, LColor::appendix);
 472
 473         return 3 * defaultRowHeight();
 474 }
 475
 476
 477 void RowPainter::paintFirst()
 478 {
 479         ParagraphParameters const & parparams = par_.params();
 480
 481         int y_top = 0;
 482
 483         // start of appendix?
 484         if (parparams.startOfAppendix())
 485                 y_top += paintAppendixStart(yo_ - row_.ascent() + 2 * defaultRowHeight());
 486
 487         Buffer const & buffer = *bv_.buffer();
 488
 489         LyXLayout_ptr const & layout = par_.layout();
 490
 491         if (buffer.params().paragraph_separation == BufferParams::PARSEP_SKIP) {
 492                 if (pit_ != 0) {
 493                         if (layout->latextype == LATEX_PARAGRAPH
 494                                 && !par_.getDepth()) {
 495                                 y_top += buffer.params().getDefSkip().inPixels(bv_);
 496                         } else {
 497                                 LyXLayout_ptr const & playout = pars_[pit_ - 1].layout();
 498                                 if (playout->latextype == LATEX_PARAGRAPH
 499                                         && !pars_[pit_ - 1].getDepth()) {
 500                                         // is it right to use defskip here, too? (AS)
 501                                         y_top += buffer.params().getDefSkip().inPixels(bv_);
 502                                 }
 503                         }
 504                 }
 505         }
 506
 507         bool const is_rtl = text_.isRTL(par_);
 508         bool const is_seq = isFirstInSequence(pit_, text_.paragraphs());
 509         //lyxerr << "paintFirst: " << par_.id() << " is_seq: " << is_seq << std::endl;
 510
 511         // should we print a label?
 512         if (layout->labeltype >= LABEL_STATIC
 513             && (layout->labeltype != LABEL_STATIC
 514                       || layout->latextype != LATEX_ENVIRONMENT
 515                       || is_seq)) {
 516
 517                 LyXFont const font = getLabelFont();
 518                 string const str = par_.getLabelstring();
 519                 if (!str.empty()) {
 520                         double x = x_;
 521                         docstring dstr(str.begin(), str.end());
 522
 523                         // this is special code for the chapter layout. This is
 524                         // printed in an extra row and has a pagebreak at
 525                         // the top.
 526                         if (layout->counter == "chapter") {
 527                                 double spacing_val = 1.0;
 528                                 if (!parparams.spacing().isDefault()) {
 529                                         spacing_val = parparams.spacing().getValue();
 530                                 } else {
 531                                         spacing_val = buffer.params().spacing().getValue();
 532                                 }
 533
 534                                 int const labeladdon = int(font_metrics::maxHeight(font) * layout->spacing.getValue() * spacing_val);
 535
 536                                 int const maxdesc = int(font_metrics::maxDescent(font) * layout->spacing.getValue() * spacing_val)
 537                                         + int(layout->parsep) * defaultRowHeight();
 538
 539                                 if (is_rtl) {
 540                                         x = width_ - leftMargin() -
 541                                                 font_metrics::width(dstr, font);
 542                                 }
 543
 544                                 pain_.text(int(x), yo_ - maxdesc - labeladdon, dstr, font);
 545                         } else {
 546                                 string lab = layout->labelsep;
 547                                 docstring dlab(lab.begin(), lab.end());
 548                                 if (is_rtl) {
 549                                         x = width_ - leftMargin()
 550                                                 + font_metrics::width(dlab, font);
 551                                 } else {
 552                                         x = x_ - font_metrics::width(dlab, font)
 553                                                 - font_metrics::width(dstr, font);
 554                                 }
 555
 556                                 pain_.text(int(x), yo_, dstr, font);
 557                         }
 558                 }
 559
 560         // the labels at the top of an environment.
 561         // More or less for bibliography
 562         } else if (is_seq &&
 563                 (layout->labeltype == LABEL_TOP_ENVIRONMENT ||
 564                 layout->labeltype == LABEL_BIBLIO ||
 565                 layout->labeltype == LABEL_CENTERED_TOP_ENVIRONMENT)) {
 566                 LyXFont font = getLabelFont();
 567                 if (!par_.getLabelstring().empty()) {
 568                         string const str = par_.getLabelstring();
 569                         docstring dstr(str.begin(), str.end());
 570                         double spacing_val = 1.0;
 571                         if (!parparams.spacing().isDefault())
 572                                 spacing_val = parparams.spacing().getValue();
 573                         else
 574                                 spacing_val = buffer.params().spacing().getValue();
 575
 576                         int const labeladdon = int(font_metrics::maxHeight(font) * layout->spacing.getValue() * spacing_val);
 577
 578                         int maxdesc =
 579                                 int(font_metrics::maxDescent(font) * layout->spacing.getValue() * spacing_val
 580                                 + (layout->labelbottomsep * defaultRowHeight()));
 581
 582                         double x = x_;
 583                         if (layout->labeltype == LABEL_CENTERED_TOP_ENVIRONMENT) {
 584                                 if (is_rtl)
 585                                         x = leftMargin();
 586                                 x += (width_ - text_.rightMargin(par_) - leftMargin()) / 2;
 587                                 x -= font_metrics::width(dstr, font) / 2;
 588                         } else if (is_rtl) {
 589                                 x = width_ - leftMargin() -
 590                                         font_metrics::width(dstr, font);
 591                         }
 592                         pain_.text(int(x), yo_ - maxdesc - labeladdon, dstr, font);
 593                 }
 594         }
 595 }
 596
 597
 598 void RowPainter::paintLast()
 599 {
 600         bool const is_rtl = text_.isRTL(par_);
 601         int const endlabel = getEndLabel(pit_, text_.paragraphs());
 602
 603         // draw an endlabel
 604         switch (endlabel) {
 605         case END_LABEL_BOX:
 606         case END_LABEL_FILLED_BOX: {
 607                 LyXFont const font = getLabelFont();
 608                 int const size = int(0.75 * font_metrics::maxAscent(font));
 609                 int const y = yo_ - size;
 610                 int x = is_rtl ? nestMargin() + changebarMargin() : width_ - size;
 611
 612                 if (width_ - int(row_.width()) <= size)
 613                         x += (size - width_ + row_.width() + 1) * (is_rtl ? -1 : 1);
 614
 615                 if (endlabel == END_LABEL_BOX)
 616                         pain_.rectangle(x, y, size, size, LColor::eolmarker);
 617                 else
 618                         pain_.fillRectangle(x, y, size, size, LColor::eolmarker);
 619                 break;
 620         }
 621
 622         case END_LABEL_STATIC: {
 623                 LyXFont font = getLabelFont();
 624                 string const & str = par_.layout()->endlabelstring();
 625                 docstring dstr(str.begin(), str.end());
 626                 double const x = is_rtl ?
 627                         x_ - font_metrics::width(dstr, font)
 628                         : - text_.rightMargin(par_) - row_.width();
 629                 pain_.text(int(x), yo_, dstr, font);
 630                 break;
 631         }
 632
 633         case END_LABEL_NO_LABEL:
 634                 break;
 635         }
 636 }
 637
 638
 639 void RowPainter::paintText()
 640 {
 641         pos_type const end = row_.endpos();
 642         pos_type body_pos = par_.beginOfBody();
 643         if (body_pos > 0 &&
 644                 (body_pos > end || !par_.isLineSeparator(body_pos - 1))) {
 645                 body_pos = 0;
 646         }
 647
 648         LyXLayout_ptr const & layout = par_.layout();
 649
 650         bool running_strikeout = false;
 651         bool is_struckout = false;
 652         int last_strikeout_x = 0;
 653
 654         // Use font span to speed things up, see below
 655         FontSpan font_span;
 656         LyXFont font;
 657
 658         for (pos_type vpos = row_.pos(); vpos < end; ) {
 659                 if (x_ > bv_.workWidth())
 660                         break;
 661
 662                 pos_type const pos = text_.bidi.vis2log(vpos);
 663
 664                 if (pos >= par_.size()) {
 665                         ++vpos;
 666                         continue;
 667                 }
 668
 669                 // Use font span to speed things up, see above
 670                 if (vpos < font_span.first || vpos > font_span.last) {
 671                         font_span = par_.fontSpan(vpos);
 672                         font = text_.getFont(par_, vpos);
 673                 }
 674
 675                 const int width_pos =
 676                         text_.singleWidth(par_, pos, par_.getChar(pos), font);
 677
 678                 if (x_ + width_pos < 0) {
 679                         x_ += width_pos;
 680                         ++vpos;
 681                         continue;
 682                 }
 683
 684                 is_struckout = isDeletedText(par_, pos);
 685
 686                 if (is_struckout && !running_strikeout) {
 687                         running_strikeout = true;
 688                         last_strikeout_x = int(x_);
 689                 }
 690
 691                 bool const highly_editable_inset = par_.isInset(pos)
 692                         && isHighlyEditableInset(par_.getInset(pos));
 693
 694                 // If we reach the end of a struck out range, paint it.
 695                 // We also don't paint across things like tables
 696                 if (running_strikeout && (highly_editable_inset || !is_struckout)) {
 697                         // Calculate 1/3 height of the buffer's default font
 698                         int const middle =
 699                                 yo_ -
 700                                 font_metrics::maxAscent(bv_.buffer()->params().getFont()) / 3;
 701                         pain_.line(last_strikeout_x, middle, int(x_), middle,
 702                                 LColor::strikeout, Painter::line_solid, Painter::line_thin);
 703                         running_strikeout = false;
 704                 }
 705
 706                 if (body_pos > 0 && pos == body_pos - 1) {
 707                         string lab = layout->labelsep;
 708                         docstring dlab(lab.begin(), lab.end());
 709                         int const lwidth = font_metrics::width(dlab,
 710                                 getLabelFont());
 711
 712                         x_ += label_hfill_ + lwidth - width_pos;
 713                 }
 714
 715                 if (par_.isHfill(pos)) {
 716                         x_ += 1;
 717
 718                         int const y0 = yo_;
 719                         int const y1 = y0 - defaultRowHeight() / 2;
 720
 721                         pain_.line(int(x_), y1, int(x_), y0, LColor::added_space);
 722
 723                         if (hfillExpansion(par_, row_, pos)) {
 724                                 int const y2 = (y0 + y1) / 2;
 725
 726                                 if (pos >= body_pos) {
 727                                         pain_.line(int(x_), y2, int(x_ + hfill_), y2,
 728                                                   LColor::added_space,
 729                                                   Painter::line_onoffdash);
 730                                         x_ += hfill_;
 731                                 } else {
 732                                         pain_.line(int(x_), y2, int(x_ + label_hfill_), y2,
 733                                                   LColor::added_space,
 734                                                   Painter::line_onoffdash);
 735                                         x_ += label_hfill_;
 736                                 }
 737                                 pain_.line(int(x_), y1, int(x_), y0, LColor::added_space);
 738                         }
 739                         x_ += 2;
 740                         ++vpos;
 741                 } else if (par_.isSeparator(pos)) {
 742                         x_ += width_pos;
 743                         if (pos >= body_pos)
 744                                 x_ += separator_;
 745                         ++vpos;
 746                 } else {
 747                         paintFromPos(vpos);
 748                 }
 749         }
 750
 751         // if we reach the end of a struck out range, paint it
 752         if (running_strikeout) {
 753                 // calculate 1/3 height of the buffer's default font
 754                 int const middle =
 755                         yo_ -
 756                         font_metrics::maxAscent(bv_.buffer()->params().getFont()) / 3;
 757                 pain_.line(last_strikeout_x, middle, int(x_), middle,
 758                         LColor::strikeout, Painter::line_solid, Painter::line_thin);
 759                 running_strikeout = false;
 760         }
 761 }
 762
 763
 764 lyx::size_type calculateRowSignature(Row const & row, Paragraph const & par,
 765         int x, int y)
 766 {
 767         boost::crc_32_type crc;
 768         for (lyx::pos_type i = row.pos(); i < row.endpos(); ++i) {
 769                 const unsigned char b[] = { par.getChar(i) };
 770                 crc.process_bytes(b, 1);
 771         }
 772         const unsigned char b[] = { x, y, row.width() };
 773         crc.process_bytes(b, 3);
 774         return crc.checksum();
 775 }
 776
 777
 778 bool CursorOnRow(PainterInfo & pi, pit_type const pit,
 779         RowList::const_iterator rit, LyXText const & text)
 780 {
 781         // Is there a cursor on this row (or inside inset on row)
 782         LCursor & cur = pi.base.bv->cursor();
 783         for (lyx::size_type d = 0; d < cur.depth(); d++) {
 784                 CursorSlice const & sl = cur[d];
 785                 if (sl.text() == &text
 786                     && sl.pit() == pit
 787                     && sl.pos() >= rit->pos()
 788                     && sl.pos() <= rit->endpos())
 789                         return true;
 790         }
 791         return false;
 792 }
 793
 794
 795 bool innerCursorOnRow(PainterInfo & pi, pit_type pit,
 796         RowList::const_iterator rit, LyXText const & text)
 797 {
 798         // Is there a cursor inside an inset on this row, and is this inset
 799         // the only "character" on this row
 800         LCursor & cur = pi.base.bv->cursor();
 801         if (rit->pos() + 1 != rit->endpos())
 802                 return false;
 803         for (lyx::size_type d = 0; d < cur.depth(); d++) {
 804                 CursorSlice const & sl = cur[d];
 805                 if (sl.text() == &text
 806                     && sl.pit() == pit
 807                     && sl.pos() == rit->pos())
 808                         return d < cur.depth() - 1;
 809         }
 810         return false;
 811 }
 812
 813
 814 void paintPar
 815         (PainterInfo & pi, LyXText const & text, pit_type pit, int x, int y,
 816          bool repaintAll)
 817 {
 818 //      lyxerr << "  paintPar: pit: " << pit << " at y: " << y << endl;
 819         static NullPainter nop;
 820         static PainterInfo nullpi(pi.base.bv, nop);
 821         int const ww = pi.base.bv->workHeight();
 822
 823         theCoords.parPos()[&text][pit] = Point(x, y);
 824
 825         Paragraph const & par = text.paragraphs()[pit];
 826         if (par.rows().empty())
 827                 return;
 828
 829         RowList::const_iterator const rb = par.rows().begin();
 830         RowList::const_iterator const re = par.rows().end();
 831
 832         y -= rb->ascent();
 833         lyx::size_type rowno(0);
 834         for (RowList::const_iterator rit = rb; rit != re; ++rit, ++rowno) {
 835                 y += rit->ascent();
 836                 // Allow setting of refreshInside for nested insets in
 837                 // this row only
 838                 bool tmp = refreshInside;
 839
 840                 // Row signature; has row changed since last paint?
 841                 lyx::size_type const row_sig = calculateRowSignature(*rit, par, x, y);
 842                 bool row_has_changed = par.rowSignature()[rowno] != row_sig;
 843
 844                 bool cursor_on_row = CursorOnRow(pi, pit, rit, text);
 845                 bool in_inset_alone_on_row = innerCursorOnRow(pi, pit, rit,
 846                         text);
 847
 848                 // If this is the only object on the row, we can make it wide
 849                 for (pos_type i = rit->pos() ; i != rit->endpos(); ++i) {
 850                         InsetBase const * const in = par.getInset(i);
 851                         if (in) {
 852                                 InsetText const * const t = in->asTextInset();
 853                                 if (t)
 854                                         t->Wide() = in_inset_alone_on_row;
 855                         }
 856                 }
 857
 858                 // If selection is on, the current row signature differs
 859                 // from cache, or cursor is inside an inset _on this row_,
 860                 // then paint the row
 861                 if (repaintAll || row_has_changed || cursor_on_row) {
 862                         // Add to row signature cache
 863                         par.rowSignature()[rowno] = row_sig;
 864
 865                         bool const inside = (y + rit->descent() >= 0
 866                                        && y - rit->ascent() < ww);
 867                         RowPainter rp(inside ? pi : nullpi, text, pit, *rit, x, y);
 868                         // Clear background of this row
 869                         // (if paragraph background was not cleared)
 870                         if (!repaintAll &&
 871                             (!in_inset_alone_on_row || row_has_changed)) {
 872                                 pi.pain.fillRectangle(x, y - rit->ascent(),
 873                                     text.maxwidth_, rit->height(),
 874                                     text.backgroundColor());
 875                                 // If outer row has changed, force nested
 876                                 // insets to repaint completely
 877                                 if (row_has_changed)
 878                                         refreshInside = true;
 879                         }
 880
 881                         // Instrumentation for testing row cache (see also
 882                         // 12 lines lower):
 883                         if (text.isMainText())
 884                                 lyxerr[Debug::PAINTING] << "#";
 885                         else
 886                                 lyxerr[Debug::PAINTING] << "[" <<
 887                                     repaintAll << row_has_changed <<
 888                                     cursor_on_row << "]";
 889                         rp.paintAppendix();
 890                         rp.paintDepthBar();
 891                         rp.paintChangeBar();
 892                         if (rit == rb)
 893                                 rp.paintFirst();
 894                         if (rit + 1 == re)
 895                                 rp.paintLast();
 896                         rp.paintText();
 897                 }
 898                 y += rit->descent();
 899                 // Restore, see above
 900                 refreshInside = tmp;
 901         }
 902         lyxerr[Debug::PAINTING] << "." << endl;
 903 }
 904
 905 } // namespace anon
 906
 907
 908 void paintText(BufferView const & bv, ViewMetricsInfo const & vi,
 909                Painter & pain)
 910 {
 911         LyXText & text = bv.buffer()->text();
 912         bool const select = bv.cursor().selection();
 913
 914         PainterInfo pi(const_cast<BufferView *>(&bv), pain);
 915         // Should the whole screen, including insets, be refreshed?
 916         bool repaintAll = select || !vi.singlepar;
 917
 918         if (repaintAll) {
 919                 // Clear background (if not delegated to rows)
 920                 pain.fillRectangle(0, vi.y1, bv.workWidth(), vi.y2 - vi.y1,
 921                         text.backgroundColor());
 922         }
 923         if (select) {
 924                 text.drawSelection(pi, 0, 0);
 925         }
 926
 927         int yy = vi.y1;
 928         // draw contents
 929         for (pit_type pit = vi.p1; pit <= vi.p2; ++pit) {
 930                 refreshInside = repaintAll;
 931                 Paragraph const & par = text.getPar(pit);
 932                 yy += par.ascent();
 933                 paintPar(pi, text, pit, 0, yy, repaintAll);
 934                 yy += par.descent();
 935         }
 936
 937         // Cache one paragraph above and one below
 938         // Note MV: this cannot be suppressed even for singlepar.
 939         // Try viewing the User Guide Mobius figure
 940
 941         if (vi.p1 > 0) {
 942                 text.redoParagraph(vi.p1 - 1);
 943                 theCoords.parPos()[&text][vi.p1 - 1] =
 944                         Point(0, vi.y1 - text.getPar(vi.p1 - 1).descent());
 945         }
 946
 947         if (vi.p2 < lyx::pit_type(text.paragraphs().size()) - 1) {
 948                 text.redoParagraph(vi.p2 + 1);
 949                 theCoords.parPos()[&text][vi.p2 + 1] =
 950                         Point(0, vi.y2 + text.getPar(vi.p2 + 1).ascent());
 951         }
 952
 953         // and grey out above (should not happen later)
 954 //      lyxerr << "par ascent: " << text.getPar(vi.p1).ascent() << endl;
 955         if (vi.y1 > 0 && !vi.singlepar)
 956                 pain.fillRectangle(0, 0, bv.workWidth(), vi.y1, LColor::bottomarea);
 957
 958         // and possibly grey out below
 959 //      lyxerr << "par descent: " << text.getPar(vi.p1).ascent() << endl;
 960         if (vi.y2 < bv.workHeight() && !vi.singlepar)
 961                 pain.fillRectangle(0, vi.y2, bv.workWidth(), bv.workHeight() - vi.y2, LColor::bottomarea);
 962 }
 963
 964
 965 void paintTextInset(LyXText const & text, PainterInfo & pi, int x, int y)
 966 {
 967 //      lyxerr << "  paintTextInset: y: " << y << endl;
 968
 969         y -= text.getPar(0).ascent();
 970         // This flag can not be set from within same inset:
 971         bool repaintAll = refreshInside;
 972         for (int pit = 0; pit < int(text.paragraphs().size()); ++pit) {
 973                 y += text.getPar(pit).ascent();
 974                 paintPar(pi, text, pit, x, y, repaintAll);
 975                 y += text.getPar(pit).descent();
 976         }
 977 }